Ricoh FT4480 Field Service Manual page 230

32 IMAGE DENSITY SENSOR
- Possible Causes -
• PTL not set
• Dirty ID sensor
• ID sensor circuit
- Action -
Clean the ID sensor and reset the PTL unit.
If the problem still exists, check the input at CN203-5. Is it less than
1.0 volt?
Y N
I
Replace the PTL unit.
Replace the main board.
41 3RD CASSETTE TRAY LIFT MOTOR
- Possible Causes -
• Lift motor stays on longer than 20 seconds.
- Action -
Is CN228-5 +5 volts when the cassette tray lift sensor is
Y N
I
Check the lift sensor circuit. Replace the lift sensor if
Is CN202-B11 +5 volts when the cassette tray lift sensor
Y N
I
Check whether CN202 and CN220 are connected properly. If they are,
replace the paper feed relay board.
Replace the main board.
failure
9-25
15 March 1987
activated?
necessary.
is activated?